Server stopped/started always. fcgi?

[AlexeyE]

Hello,
I think my vserver is slow (some sites), I receive 50x errors (internal error, temporar unavailable), I try install nginx as frontend for Apache, but it was some problem with configuration, had deinstall it and I think first configure Apache+fcgi, then nginx. I have read dotzend articles, and now I dont really know, how do I configure it and use with vhost.conf. (read somewhere, that impossible)
So: I have:
vserver Mem: 2Gb (used 600-700 Mb)
Plesk 9.5.4
Debian Lenny
Php 5.2.6-1+lenny13 with Suhosin-Patch 0.9.6.2 (cli) (built: Jul 1 2011
10 vHosts on vServer, all configurated as fastcgi:
In Web hosting setup for domains in PleskPanel:
PHP support: run as fastcgi-app, with safe-mod "on"
FastCGI support (required for Ruby on Rails): checked


In /etc/apache2/mods-enabled/fcgid.conf

AddHandler fcgid-script .fcgi .php .php5
PHP_Fix_Pathinfo_Enable 1

In all phph.ini's (cli, cgi, apache2) in /etc/php5/
memory_limit: 128Mb
cgi.fix_pathinfo=1

Thank you

from: http://forum.parallels.com/showthread.php?t=38431&highlight=fcgi
I do not have this: /usr/local/psa/apache/conf/httpd.conf
Only: /usr/local/psa

I need fastcgi for right permissions for users
Is it possible made with suPhp and what is better ?